Slide 1

27-Day Variations Of The Galactic Cosmic Ray Intensity And Anisotropy In Different Solar Magnetic Cycles (1964-2004) M.V. Alania, A. Gil, K. Iskra, R. Modzelewska Slide 2 Abstract We study the 27-day variations of the GCR anisotropy and intensity, solar wind velocity and interplanetary magnetic field strength for different solar magnetic cycles. We find that the average amplitudes of the 27-day variation of the GCR anisotropy for the minima epochs of solar activity are larger in the solar positive polarity period than in the negative polarity period being in a good correlation with the similar changes of the amplitudes of the 27-day variation of the GCR intensity versus the solar magnetic cycles. The amplitudes of the 27-day variations of the anisotropy, SW velocity and IMF do not depend on the TA of the HNS for different the qA>0 and the qA0 and the qA Changes of the A27A and A27I versus the time The converted to the heliosphere average amplitudes of the A27I (squares) and A27A (triangles) obtained by Kiel and Rome neutron monitors data for the qA>0 (1975-78 and 1995-98) and the qA Harmonic diagram of the average anisotropies of GCR for the periods of different periods of solar magnetic cycle Harmonic diagram of the average anisotropies of GCR for the periods of qA>0 and qA Conclusions The amplitudes of the 27-day variations of the GCR anisotropy, IMFs strength and SW velocity do not depend on the tilt angles of the HNS for the period of 1976-2004. The amplitudes of the 27-day variation of the GCR anisotropy are considerably larger in the minima and near minima epoch for the qA>0 periods than for the qA